Time left 1 Intensity of sound at a point is ____ its distance from the source. directly proportional to inversely proportional to directly proportional to square of inversely proportional to square of 2 Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open at sea level at the top of Mt. Everest at a place in a valley below sea level in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level 3 Radio telescopes are better than optical telescopes because they can detect faint galaxies which no optical telescope can they can work even in cloudy conditions they can work during the day and night All of the above 4 Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit X-rays ultraviolet light visible light radio waves 5 Out of the following pairs, which one does not have identical dimension? Moment of inertia and moment of a force Work and Torque Angular momentum and Planck's constant Impulse and Momentum 6 Mercury is commonly used as a thermometric fluid rather than water because specific heat of mercury is less than water specific heat of mercury is more than water mercury has greater visibility than water density of mercury is more than the water 7 Optical fibre works on the principle of refraction total internal reflection scattering interference 8 Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in 4.2 seconds 42 seconds 4.2 years 42 years
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